Spot footing

Abstract

Spot footing designed especially for securing a precast concrete or timber column to a foundation and/or for extending such a column, said spot footing comprising a base plate ( 3 ) provided with a mounting hole ( 7 ), and a substantially cylindrical, rigid protective casing consisting of a top plate ( 2 ) and a side wall part ( 4, 6 ) having an opening ( 5 ), an anchor bar being secured to said top plate ( 2 ). The spot footing comprises two or more anchor bars ( 1 ) secured to the top plate ( 2 ) and specifically so disposed in the top plate that the anchor bars are located substantially around the hole ( 7 ) of the base plate ( 3 ).

1 . Spot footing designed especially for securing a precast concrete or timber column to a foundation and/or for extending such a column, said spot footing comprising a base plate ( 3 ) provided with a mounting hole ( 7 ), and a cylindrical protective casing consisting of a top plate ( 2 ), a side wall part ( 4 ,  6 ) having an opening ( 5 ) and anchor bars, characterized in that 
 the spot footing comprises two or more anchor bars ( 1 ) secured to the top plate ( 2 ) so that the loads are transmitted via anchor bars ( 1 ), the top plate ( 2 ), the wall part ( 4 , 6 ) and the base plate ( 3 ), and    the top plate consists of a thicker force-transmitting part ( 2 ) and a thin protective casing part ( 2 ″), which is fittable against the column mold.    
   
   
       2 . Spot footing according to  claim 1 , characterized in that one or more vertical anchor bars ( 8 ) are secured, e.g. by welding, to the back side of the side wall part ( 4 ) substantially on an axis of symmetry.  
   
   
       3 . Spot footing according to  claim 1 , characterized in that the side walls ( 4 ,  6 ) of the protective casing are so shaped that, in respect of material strength, the center of gravity of the cross-section of the wall is located substantially at the center of the bolt hole ( 7 ).  
   
   
       4 . Spot footing according to  claim 1 , characterized in that the hole ( 7 ) of the base, plate ( 7 ) is elliptical.  
   
   
       5 . Spot footing according to  claim 1 , characterized in that the top plate ( 2 ) of the protective casing is provided with a round hole ( 9 ) located in alignment with the hole in the base plate ( 3 ), allowing the use of prestressing cables.  
   
   
       6 . Spot footing according to  claim 1 , characterized in that the anchor bars are so disposed in the top plate that the anchor bars are located substantially around the hole ( 7 ) of the base plate ( 3 ).  
   
   
       7 . Spot footing according to  claim 1 , characterized in that the top plate ( 2 ) consists of two parts ( 2 ′,  2 ″) of different thicknesses, either so that the top plate ( 2 ) edge ( 2 ″) fitted against the column mold is made of thinner material than part ( 2 ′), or so that the thinner part is secured to the frontal surface of the thicker part.